Penmanship was taken seriously 30 years ago.. at least by the nuns at St. Pats! Their methods were, at the time, considered old fashioned. But, we were drilled on penmanship. You learned 2 letters a week and you practiced them until you got it 'right'. There was only ONE way to make any letter, no deviation... or else!
Since their methods were 'old fashioned' 30 years ago, it's no wonder that 100 year old handwriting of various individuals deviated little.
"If you've got time to breathe, you've got time for music," Briscoe Darling